Thousands of Bombardier workers in Northern Ireland will “flex their muscles” if a trade ruling goes against the aircraft manufacturer, a union leader has warned.

The United States Commerce Department has confirmed plans to impose duties of 292% on imports of Bombardier’s C Series commercial jets.

Unite has called on the US International Trade Commission (ITC) to set aside the decision when it meets in the coming days to discuss whether rival Boeing has suffered injury or loss as a result of Delta Airlines’ order of C Series jets.